Thread-controller for sewing-machines.



J. S. FINGH. THREAD CONTROLLER FOR SEWING MACHINES.

APPLICATION FILED APR. 23, 1912.

Patented Dec. 16, 1913.

2 SHEETS-SHEET 1.

WITNESSES:

BYIVWW ATTORNEY J. S. FINOH.

THREAD CONTROLLER FOR SEWING MACHINES.

APPLICATION FILED APR.23, 1912.

1,081,596. Patented Dec.16,1913.

2 SHEETS-SHEET 2.

WITNESSES: MENTOR 4%? Jaw dim AM PM By. .2

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TUBING consent, 11 conronarlon or new cnnsn'ir.

THREAD'CONTROIJLER FOR SEWINGMACHH TES,.

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Specification of Letters'ia'tcnt.

Patented ties. to, 1913.

Application filed April as, 1912. serial No. 692,800.

7b (ZZZ whom 2'5 may concern:

lie it known that I. JOHN S. FINCH, a,

citizen of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Thread- Controllers for Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in sewing machines of the class employing a bar having stitch-forming movements in a sin the formation of a straight-away scam, or

in different vertical planes, in the 'forma- ObjQCl; controlling the slack tion of a zigzag seam, and has for its of the needle-thread to meet the require ments of changes in the amplitude of vibration of the needle.

The invention is shown as applied to a Singer 107w class machine, but as it relates mainly to the construction and application of the means for controlling the needle thread, only such reference will be made to the other elements of the machine as is deemed necessary for a proper understanding of its application.

In the accompanying drawings illustrating the invention in the several figures cl. which like. parts are similarly designated, Figure l is a view in front side elevation of a sewing machine equipped with the "present invention, the bracket arm being broken out to better illustrate certain details in con struction to be referred to hereinafte Fig. 2 is a rear side elevation of Fig.1. Fig, 8 is a view in perspective of a portion 01 the needle-thread tension and controlling n1echanisnn Fig. 4. is a central section of the oscillating cam shaft for controlling the lateral movements of the neadlibz r and certain parts directly connected with said cam shaft, together with a view in section of a portion or" the arm bracket. is a view of the inner end of the cam shaft, together with adotted line view of the forked end of the needlebar-carrying frame connection. Fig. 6 a view in perspective of the ln'acket arm plate provided with a bearing into which the front na led. Fig. 7 is a'diagranimatic view, contrasting difi'erent forms of seams tor which the present constr ction is adaptedgle vertical plane, as in end of a gear, shaft is jourshaft 18 is mounted a needlevibrating' cam '22, later to be referred to,

Referring to the figures, 1 represents the bed-pl ate of the sewing machine upon which is mounted the bracket arm comprising *the arm bracket 2 and standard 8, 4 the main or needle-'bar-driving shaft provided at its rear end with-a band or hand wheel 5 and at i its opposite end with one form of commonly i employed shaft flange (not shown) to which :1 is pivotally connected the usual needleben actuating link (not shown) operatively con-- nected with the needlebar 6 carryinganeye-pointed needle 7, 8 and 9'the needle- 1 thread tension and take up, respectively,q said tension being equipped with the (50111- monly employed thread-controller spring .69, 10 the cloth:presser-carryingbar, and 11,11 A the cloth-pressers. The needle bar '6; is mounted to move vertically in the needle bar-carrying frame 12 pivoted at its upper end on a suitable bolt threaded'into them bracket arm (as shown at 13, Fig. =2), and 1.4. represents the presser-lifting lever for moving the cloth-pressers vertically to 3 01'. cornmodate the position of the fabric with respect to-the lineof needle actuation.

As the feeding mechanism herein employed is of commonconstruction, substan tially the same as is represented h'y U. S. Patent No. 718,988, issued January 27, 1903, to W. F. Dial at aZ., it has been deemed snflicient to designate the elements illusi trated by the numeral '15,and for a like, reason the elements located below the bedplate of the sewing machine andforming a part of the stitch-forming mechanism are not shown. a

16 represents a spiral :gear carried by the main shaft which meshes with a spiral gear 17 carried by a gear shaft 18 mounted at one end in a bearing 19 formed in the bracket arm, and at its opposite end in a bearin 20 formed in the bracket arm 1 late 21, an as 1 said gears are of the ratio or two to one, the gear shaft 18 is given one rotation to tworotations of said main 'sha-ft. On the gear,

and upon the main shaft secured. a belt-driving pulley 23 connected by a belt 24 with the gisual belt-- driven pulley (not shown) carried by the commonly employed loop-taker-driving shaft not shown). I 25 represents an oscillating cam shaft mounted in a bearing 26. iformetlintegral with the bracket arm and carrying at its 3.1 0

outer end a crank arm 27 connected by a link 28 with one end of a rock-lever 29, the oppo;

site end of which is connected with a rod 30 which is moved vertically, at the will of the operator, through a suitable treadle (not shown), and in opposition to the resiliency of a spring 31, the latter normally acting to hold the end 32 of the crank arm 27 in contact with a stationary lug 33 forming a part of a collar 34 secured by screw 35 on a hub 36 forming the bearing 26, or in position to hold the needle-bar against lateral or zigzag movements.

The inner end of the cam shaft 25 is provided with enlarged portions 37 and 38, in the latter of which is formed a groove 39 in which tracks a slide block 40 mounted on a stud 41 having formed integral with it a flange 42, said stud passing through a needle-carrying-frame connection 43 and being secured by a nut 44 and said flange 42 against movement in the direction of its length, the connection 43 being forked to embrace the cam 22 and at its opposite end pivotally connected by screw 45 to the needle-bar-carrying frame 12.

From the foregoing it will be understood that the cam 22 causes the connection 43 to be oscillated on its pivot screw 45, and that when the cam shaft 25 is adjusted to negative the cam action of the groove 39 on the slide block 40, there will be no movement of the connection 43 in the direction of its length, the needle-bar being thus held adjusted for eifecting the ordinary straightaway seam, as represented at a, Fig. 7; but when, through the manipulation of the rod 30, the cam shaft 25 is adjusted to position the groove 39 at an angle tothe line of movement of the slide block 40, as shown in Fi 5, movements in the direction of its len gth will be transmitted to the connection 43, thus causing the needle-bar to be moved laterally and planes to effect a zigzag seam, the width of such zigzag seam being dependent upon the adjustment of the end 32 of the crank arm 27 with respect to the lug 33, or to the angle given to the groove 39 with respect to the movements of the slide block 40.

Referring now to the parts more directly connected with the invention, 47 represents a rock-shaft journaled in suitable bearings formed in the arm bracket, and upon one end of said shaft is suitably secured a crank arm 48 connected by a link 49 with a second crank arm 50 secured by screws, as 51, upon the hub 52 of the rock lever 29, the opposite end of said rock-shaft carrying a crank arm 53 connected by a link 54 with a thread-controller spring stop collar 55 loosely mounted on the hub 56 formed integral with the arm bracket, a screw 57 acting to hold said collar against accidental displacement. The collar 55 is provided with a shoulder 58 against of the lateral movements of the actuated in different verticalwhich the loop 59 of the controller spring 60 rests when not acted on'by the thread in the formation of the stitch.

64 represents an adjusting screw threaded into the lug 33, said screw, in connection $9 with a like screw 65 threaded into the lug 66 of the collar 34, acting to hold the'crank arm 27 in its adjustment for effecting a continuous zigzag seam of a given width, as represented by sections 22, c, Fig. 7, and when it is desired to effect overseaming, as represented by section (Z, Fig. 7, the operator, through the means previously pointed out,,adjusts the groove 39 with respect to the slide block 40 to vary the lateral movements of the needle to'correspond to the design or figure required, and in doing so the manipulation of the rock lever 29, through the connecting elements 47 to 54, both inclusive, causes the shoulder 58 of the stop collar 55 to be adjusted into position to permit of the greater take-up action of the thread-controller spring 60 when stitching a straightaway seam, and a lesser take-up action when stitching a zigzag scam, the extent of said take-up action being controlled by the extent needle, thus adjusting the movements of said threadcontroller spring to the requirements of the seam. 5

Claims 2- I 1. In a se inmachine, the combination with fabric-feeding and stitch-forming mechanism, said stitch-forming mechanism including a needle thread take-up and means 195 for controlling the movements of the needlebar in diiferent vertical planes, of means including a thread-controller spring and spring stop, the latter operatively connected with said needle-bar-controlling means for controlling the slack of the needle-thread in the formation of stitches of diiferent character.

2 In a sewing machine, the combination with fabric-feeding and stitch-forming 11 mechanism, said stitch-forming mechanism including a needle-thread take-up means for controlling the movements of the needle-bar in difierent vertical planes, of means including a thread-controller spring and a spring stop, the latter operatively connected, through a rock-shaft mounted on the sewing machine bracket arm, with said needle-barcontrolling means for controlling the slack of the needle'thread in the formation of stitches of different character.

3. In a sewing machine, the combination with fabric-feeding and stitch forming mechanism, said stitch-forming mechanism including a needle-thread take-up a needlethread tension and means for controlling the movements of the needle-bar in different vertical planes, of a. thread-controller spring and spring stop, the latter located between said needle-bar and said needle-thread ten- 13a sion and operatively connected menses with said needle-bar controlling means for controlling the slack of the needle-thread in'the formation of stitches of diiferent character.

'4. In a sewing machine; the combination with fabric-feeding ahd stitch-forming mechanisms, said stitch-forming mechanism including a needle-thread take-up, a needle-- thread tension, means for controllin the movements of the needle-bar in di erent vertical planes, a needle-thread controller spring and an adjustable spring stop 10-" cated between said take-up' and tension, of

means for ad respect to said controller spring to change is til listing said spring stop vilith the extent of movement of the latter to correspond to the changes in amplitude of the vibrations of the needle-bar 1n the forma tion of stitches of different character.

In testimony whereof, I have signed. in" name to this specification, two subscribing Witnesses.

A JOHN S. FINCIZ Vitnesses F. W. comm,

ABBIE M. DONIHEE.

in the presence w 

